Priority Claim
Technical Field
[0002] Various embodiments described herein relate to communications generally, including
apparatus, systems, and methods used to transmit and receive information via wireless
networks.
Background Information
[0003] High-throughput (HT) methods in wireless communications may require modification
to existing packet and channel formats. Newer devices may operate to support both
HT and legacy technologies by transmitting header information intelligible to both.
Such information may beneficially cause a legacy device to delay transmission and
thereby avoid spectral conflict with an HT device. However, the legacy device may
fail to completely interpret a packet received from the HT device. Such failure may
detrimentally cause the legacy device to perform a longer back-off than that of HT
devices, resulting in a fundamental unfairness in legacy device access to available
bandwidth.
US 2002/0184389A1 relates to interference suppression methods for 802.11 wherein a second source station
on a wireless local area network, that does not practice the enhanced 802.11 e standard,
is prevented from starting transmission on a medium whilst a first source station
is transmitting on that medium.
Brief Description of the Drawings
[0004] FIG. 1 comprises a timing diagram according to various embodiments of the invention.
[0005] FIG. 2 is a block diagram of an apparatus and a system according to various embodiments
of the invention.
[0006] FIG. 3 is a flow diagram illustrating several methods according to various embodiments
of the invention.
[0007] FIG. 4 is a block diagram of an article according to various embodiments of the invention.
Detailed Description
[0008] Various embodiments disclosed herein address a fundamental unfairness that may occur
in mixed-generation wireless networks during physical layer convergence procedure
header spoofing operations. "Physical layer convergence procedure header spoofing
operations" may include setting a duration value in a header portion of an HT wireless
packet to a value the same as or different from an actual duration of the HT packet,
to protect one or more HT packets from radio frequency interference by the legacy
device. "Mixed-generation wireless networks" may include legacy Institute of Electrical
and Electronics Engineers (IEEE) 802.11 systems and (for example) IEEE 802.11TGn systems,
known to those skilled in the art, and sometimes referred to as "high-throughput"
networks.
[0009] Physical layer convergence procedure header spoofing may begin when a legacy device
receives an HT packet with a physical layer convergence procedure header intelligible
to the legacy device. The legacy device may read a rate and a length from the header,
calculate a packet duration, and perform a cyclical redundancy code integrity check
on the received packet upon expiration of the calculated packet duration. Although
the integrity check may fail, the spoofing operation may provide a mode whereby legacy
devices delay transmitting upon receipt of the HT packets and thus avoid interfering
with such packets. For more information regarding IEEE 802.11 standards, please refer
to "IEEE Standards for Information Technology -- Telecommunications and Information
Exchange between Systems -- Local and Metropolitan Area Network -- Specific Requirements
-- Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY), ISO/IEC
8802-11: 1999" and related amendments.
[0010] FIG. 1 comprises timing diagrams according to various embodiments of the invention.
In these diagrams, various embodiments are shown for simplicity, and they should not
be used to limit any of the embodiments disclosed herein. For example, a modified
duration parameter may be calculated to be a function of a distributed interframe
space (DIFS) period and an extended interframe space period (EIFS). However, various
functions of other variables may also be used to calculate the modified duration parameter
disclosed herein.
[0011] Referring now to FIG. 1, assume that an HT communications device receives an HT packet
III during a time 113. The HT device may wait a DIFS period 115 before initiating
backoff 121 at time 125.
[0012] In FIG. 1, it can be seen that a legacy device may read a header 127 from an HT packet
135. After a packet duration 141 encoded into the header 127 has elapsed, the legacy
device may perform a cyclical redundancy code (CRC) integrity check on the contents
of the packet 135 as received. The integrity check may fail, since portions of the
HT packet 135 may be unreadable by the legacy device.
[0013] Upon CRC check failure, the legacy device may wait an EIFS period 149 before instituting
a backoff 155 at a time 159, in order to avoid interference. The difference between
the wait period 115 associated with an HT device and the wait period 149 associated
with a legacy receiving device may represent a fundamental unfairness 161 to the legacy
receiving device in media access.
[0014] In some embodiments, an HT packet 165 may be transmitted with a header 167 including
a modified duration parameter. The modified duration parameter may cause a legacy
device to perform a CRC integrity check on a contents of the packet 165 thus received
at a spoofed end-of-packet time 171 prior to a time 173 corresponding to an actual
end of a transmission of the packet 165. In some embodiments, the time 171 may be
selected to be equal to the time 173 less a period 176 of an EIFS minus a period of
a DIFS. Other embodiments may select a different time 171. Upon packet integrity check
failure, the legacy device may enter a backoff 189 at a time 193, following an EIFS
period 195 which may be substantially aligned with the time 125 at which an HT device
may enter backoff 121. As one skilled in the art can see from FIG. 1, this implementation
of a modified duration parameter may resolve the problem of a fundamental unfairness
in media access.
[0015] Some embodiments may implement the technique of FIG. 1 to protect a plurality of
sequentially transmitted HT packets, wherein duration 141 may correspond to a sum
of all durations in the plurality, plus the sum of all inter-packet space periods.
Modifying a packet duration parameter associated with the plurality of sequentially
transmitted HT packets may cause a legacy device to select a time 171 to be equal
to a time 173 less a period 176 of an EIFS 195 minus a period of a DIFS 115. This
procedure may result in HT and legacy devices entering backoff at substantially the
same time, and thus result in greater fairness in media access in a mixed-generation
environment
[0016] FIG. 2 is a block diagram of an apparatus 200 and a system 220 according to various
embodiments of the invention. The apparatus 200 may include a processing element 228
to transmit, within a mixed-generation network 238 including a legacy device 244,
at least one packet 252 to the legacy device 244, wherein the at least one packet
252 includes a modified duration parameter. In some embodiments of the apparatus 200,
a value of the modified duration parameter may be less than a first duration 272 of
the at least one packet 252. Some embodiments of the apparatus 200 may set a value
of the modified duration parameter to the first duration 272 of the at least one packet
252, less a period of an EIFS, minus a period of a DIFS.
[0017] In some embodiments of the apparatus 200, the modified duration parameter may be
transmitted using rate and/or length values 264 included in a legacy-compatible physical
layer header 278. In some embodiments of the apparatus 200, the mixed-generation network
238 may include an HT device 284 operating according to an IEEE 802.11TGn protocol.
Other embodiments may be realized.
[0018] For example, a system 220 may include an apparatus 200, as well as an energy conduit
288. The energy conduit 288 may be selected from one or more of an omnidirectional
antenna, a patch antenna, a dipole antenna, a unidirectional antenna, an infra-red
transmitter, an infra-red receiver, photo-emitters and receptors, and charge-coupled
devices, among others. Some embodiments of the system 220 may include at least one
additional antenna 290 coupled to a transmitter 292.
[0019] The system 220 may, in some embodiments, include a legacy device 244 to receive a
modified duration parameter and an HT device 284 to transmit the modified duration
parameter. Some embodiments of the system 220 may include an antenna 290 and a transmitter
292 coupled to the antenna 290 to transmit, within a mixed-generation network 238
including the legacy device 244, at least one packet 252 to the legacy device 244,
wherein the at least one packet 252 includes a modified duration parameter. In some
embodiments of the system 220, a value of the modified duration parameter may be less
than a first duration 272 of the at least one packet 252. In some embodiments, the
modi fied duration parameter may be set to a value of the first duration 272 of the
at least one packet 252, less a period of an EIFS minus a period of a DIFS. In some
embodiments of the system 220, the modified duration parameter may be encoded according
to an IEEE 802.11 standard.
[0020] The HT packet 111, time 113, DIFS period 115, backoff 121, time 125, header 127,
HT packet 135, packet duration 141, header 127, EIFS period 149, backoff 155, time
159, wait period 115, packet 165, header 167, time 171, time 173, backoff 189, time
193, EIFS period 195, apparatus 200, system 220, processing element 228, mixed-generation
network 238, legacy device 244, packet 252, first duration 272, rate and/or length
values 264, legacy-compatible physical layer header 278, HT device 284, energy conduit
288, antenna 290, and transmitter 292 may all be characterized as "modules" herein.
Such modules may include hardware circuitry, and/or a processor and/or memory circuits,
software program modules and objects, and/or firmware, and combinations thereof, as
desired by the architect of the apparatus 200 and system 220, and as appropriate for
particular implementations of various embodiments. For example, such modules may be
included in a system operation simulation package, such as a software electrical signal
simulation package, a power usage and distribution simulation package, a capacitance-inductance
simulation package, a power/heat dissipation simulation package, a signal transmission-reception
simulation package, and/or a combination of software and hardware used to simulate
the operation of various potential embodiments.
[0021] It should also be understood that the apparatus and systems of various embodiments
can be used in applications other than for human-computer interface devices, and thus,
various embodiments are not to be so limited. The illustrations of apparatus 200 and
system 220 are intended to provide a general understanding of the structure of various
embodiments, and they are not intended to serve as a complete description of all the
elements and features of apparatus and systems that might make use of the structures
described herein.
[0022] Applications that may include the novel apparatus and systems of various embodiments
include electronic circuitry used in high-speed computers, communication and signal
processing circuitry, modems, processor modules, embedded processors, data switches,
and application-specific modules, including multilayer, multi-chip modules. Such apparatus
and systems may further be included as sub-components within a variety of electronic
systems, such as televisions, cellular telephones, personal computers, workstations,
radios, video players, vehicles, and others. Some embodiments include a number of
methods.
[0023] FIG. 3 is a flow diagram illustrating several methods 311 according to various embodiments
of the invention. For example, a method 311 may (optionally) begin at block 321 with
using physical layer convergence procedure header spoofing to transmit a modified
duration parameter. The method 311 at block 321 may include operating a high-throughput
device according to a protocol defined by an Institute of Electrical and Electronics
Engineers amendment 802.1 In to an Institute of Electrical and Electronics Engineers
802.11 standard.
[0024] The method 311 may continue with selecting the modified duration parameter to avoid
an unfairness in media access between a legacy device and another device at block
325. It should be noted that the modified duration parameter of method 311 may be
associated with a plurality of sequentially transmitted HT packets. The method 311
may include setting the modified duration parameter by modifying at least one of a
length field and a rate field at block 331. It should be noted that the modified duration
parameter of block 331 may be set to less than a duration of at least one packet,
and/or a value of the duration of the at least one packet, less a period of an EIFS
minus a period of a DIFS, among others.
[0025] Note that the method 311 may include formatting at least one packet according to
an IEEE 802.11 standard at block 335. The method 311 may include adjusting a point
in time of cyclical redundancy code failure determination associated with the at least
one packet at block 341. The method 311 may include transmitting, within a mixed-generation
network including a legacy device, at least one packet to the legacy device, wherein
the at least one packet includes a modified duration parameter at block 351.
[0026] The method 311 may operate to avoid unfairness in media access between the legacy
device and another device at block 357. The method 311 may (optionally) terminate
by performing a carrier sense multiple access collision avoidance backoff procedure
at block 365.
[0027] It should be noted that the methods described herein do not have to be executed in
the order described, or in any particular order. Moreover, various activities described
with respect to the methods identified herein can be executed in serial or parallel
fashion. Information, including parameters, commands, operands, and other data, can
be sent and received in the form of one or more carrier waves.
[0028] Upon reading and comprehending the content of this disclosure, one of ordinary skill
in the art will understand the manner in which a software program can be launched
from a computer-readable medium in a computer-based system to execute the functions
defined in the software program. One of ordinary skill in the art will further understand
the various programming languages that may be employed to create one or more software
programs designed to implement and perform the methods disclosed herein. The programs
may be structured in an object-orientated format using an object-oriented language
such as Java or C++. Alternatively, the programs can be structured in a procedure-orientated
format using a procedural language, such as assembly or C. The software components
may communicate using any of a number of mechanisms well known to those skilled in
the art, such as application program interfaces or interprocess communication techniques,
including remote procedure calls. The teachings of various embodiments are not limited
to any particular programming language or environment. Thus, other embodiments may
be realized.
[0029] For example, FIG. 4 is a block diagram of an article 485 according to various embodiments
of the invention. Examples of such embodiments may comprise a computer, a memory system,
a magnetic or optical disk, some other storage device, and/or any type of electronic
device or system. The article 485 may include a processor 487 coupled to a machine-accessible
medium such as a memory 489 (e.g., a memory including an electrical, optical, or electromagnetic
conductor) having associated information 491 (e.g., computer program instructions
and/or data), which, when accessed, results in a machine (e.g., the processor 487)
performing such actions as transmitting, within a mixed-generation network including
a legacy device, at least one packet to the legacy device, wherein the at least one
packet includes a modified duration parameter.
[0030] Other activities may include setting the modified duration parameter to a value of
a duration of the at least one packet, less a period of an EIFS minus a period of
a DIFS. Further activities may include selecting the modified duration parameter to
avoid unfairness in media access between the legacy device and another device. Some
activities may include selecting the other device to be an HT device operating according
to an IEEE 802.11 TGn protocol.
[0031] Implementing the apparatus, systems, and methods disclosed herein may decrease spectral
interference in a mixed-generation environment, including for example, between legacy
and HT devices.
[0032] The accompanying drawings that form a part hereof show by way of illustration, and
not of limitation, specific embodiments in which the subject matter may be practiced.
The embodiments illustrated are described in sufficient detail to enable those skilled
in the art to practice the teachings disclosed herein. Other embodiments may be utilized
and derived therefrom, such that structural and logical substitutions and changes
may be made without departing from the scope of this disclosure. This Detailed Description,
therefore, is not to be taken in a limiting sense, and the scope of various embodiments
is defined only by the appended claims.
[0033] Such embodiments of the inventive subject matter may be referred to herein, individually
and/or collectively, by the term "invention" merely for convenience and without intending
to voluntarily limit the scope of this application to any single invention or inventive
concept if more than one is in fact disclosed. Thus, although specific embodiments
have been illustrated and described herein, it should be appreciated that any arrangement
calculated to achieve the same purpose may be substituted for the specific embodiments
shown. This disclosure is intended to cover any and all adaptations or variations
of various embodiments. Combinations of the above embodiments, and other embodiments
not specifically described herein, will be apparent to those of skill in the art upon
reviewing the above description.
1. A method, comprising:
transmitting, within a mixed-generation network (238) including a legacy device (244)
operating according to an Institute of Electrical and Electronic Engineers 802.11
protocol, at least one packet (252) to the legacy device (244), wherein the at least
one packet (252) includes a modified duration parameter; characterised in that
said network (238) includes a high throughput device (284) operating according to
an Institute of Electrical and Electronics Engineers 802.11 TGn protocol; and
wherein the modified duration parameter is associated with a plurality of sequentially
transmitted high-throughput packets (165).
2. The method of claim 1, wherein a value of the modified duration parameter is less
than a first duration (272) of the at least one packet (252).
3. The method of claim 2, including:
setting the modified duration parameter to a value substantially equal to the first
duration (272), less a period of an extended interframe space minus a period of a
distributed interframe space.
4. The method of claim 1, including:
using physical layer convergence procedure header spoofing to transmit the modified
duration parameter.
5. The method of claim 1, including:
adjusting a point in time of cyclical redundancy code failure determination associated
with the at least one packet.
6. The method of claim 1, including:
avoiding unfairness in media access between the legacy device and the high-throughput
device (284).
7. The method of claim 1, including:
setting the modified duration parameter by modifying at least one of a length field
and a rate field.
8. The method of claim 1, including:
formatting the at least one packet according to an Institute of Electrical and Electronic
Engineers 802.11 standard.
9. The method of claim 1, further including:
performing a carrier sense multiple access collision avoidance backoff procedure.
10. A computer-implemented storage medium having instructions stored thereupon, wherein
when said instructions are carried out, results in a machine performing the following
method steps:
transmitting, within a mixed-generation network (238) including a legacy device (244)
operating according to an Institute of Electrical and Electronic Engineers 802.11
protocol, at least one packet (252) to the legacy device (244), wherein the at least
one packet (252) includes a modified duration parameter; characterised in that
said network (238) includes a high thoughput device (284) operating according to an
Institute of Electrical and Electronics Engineers 802.11TGn protocol; and
wherein the modified duration parameter is associated with a plurality of sequentially
transmitted high-throughput packets (165).
11. The storage medium of claim 10, wherein the modified duration parameter is selected
to avoid unfairness in media access between the legacy device and the high-throughput
device (284).
12. The storage medium of claim 10, wherein the at least one packet (252) includes a physical
layer convergence procedure header.
13. An apparatus, including:
a processing element (228) for transmitting, within a mixed-generation network (238)
including a legacy device (244) operating according to an Institute of Electrical
and Electronic Engineers 802.11 protocol, at least one packet (252) to the legacy
device (244), wherein the at least one packet (252) includes a modified duration parameter;
characterised in that
said network (238) includes a high throughput device (284) operating according to
an Institute of Electrical and Electronics Engineers 802.11TGn protocol; and
wherein a value of the modified duration parameter is less than a first duration (272)
of the at least one packet (252).
14. The apparatus of claim 13, wherein the modified duration parameter is set to a value
of the first duration of the at least one packet (252), less a period of an extended
interframe space minus a period of a distributed interframe space.
15. The apparatus of claim 13, wherein the modified duration parameter is transmitted
using rate and length values included in a legacy-compatible physical layer header.
1. Verfahren, das Folgendes umfasst:
Übertragen, innerhalb eines Mehrgenerationen-Netzwerks (238), das ein Legacy-Gerät
(244) enthält, das gemäß einem Institute of Electrical and Electronic Engineers 802.11-Protokoll
arbeitet, mindestens eines Paketes (252) an das Legacy-Gerät (244), wobei das mindestens
eine Paket (252) einen modifizierten Zeitdauerparameter enthält; dadurch gekennzeichnet, dass
das Netzwerk (238) ein durchsatzstarkes Gerät (284) enthält, das gemäß einem Institute
of Electrical and Electronic Engineers-802.11TGn-Protokoll arbeitet; und
wobei der modifizierte Zeitdauerparameter mehreren der Reihe nach gesendeten durchsatzintensiven
Paketen (165) zugeordnet ist.
2. verfahren nach Anspruch 1, wobei ein Wert des modifizierten Zeitdauerparameters kleiner
ist als eine erste Dauer (272) des mindestens einen Paketes (252).
3. Verfahren nach Anspruch 2, das Folgendes enthält:
Setzen des modifizierten Zeitdauerparameters auf einen Wert im Wesentlichen gleich
der ersten Dauer (272), abzüglich eines Zeitraums eines erweiterten Interframe-Raumes
minus eines Zeitraums eines verteilten Interframe-Raumes.
4. Verfahren nach Anspruch 1, das Folgendes enthält:
Verwenden eines Physical Layer Convergence Procedure Teilschicht (PCLP)-Header-Spoofing
zum Senden des modifizierten Zeitdauerparameters.
5. Verfahren nach Anspruch 1, das Folgendes enthält:
Justieren eines Zeitpunktes einer zyklischen Redundanzcodefehler-Bestimmung, die dem
mindestens einen Paket zugeordnet ist.
6. Verfahren nach Anspruch 1, das Folgendes enthält:
Vermeidet einer Ungleichbehandlung beim Medienzugang zwischen dem Legacy-Gerät und
dem durchsatzintensiven Gerät (284).
7. Verfahren nach Anspruch 1, das Folgendes enthält:
Setzen des modifizierten Zeitdauerparameters durch Modifizieren mindestens eines Längenfeldes
und eines Ratenfeldes.
8. Verfahren nach Anspruch 1, das Folgendes enthält:
Formatieren des mindestens einen Paketes gemäß einem Institute of Electrical and Electronic
Engineers-802.11-Standard.
9. Verfahren nach Anspruch 1, das des Weiteren Folgendes enthält:
Ausführen eines Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA, Mehrfachzugriff
mit Trägerprüfung und Kollisionsvermeidung) Backoff-Verfahrens.
10. Computerimplementiertes Speichermedium, auf dem Instruktionen gespeichert sind, wobei
das Ausführen der Instruktionen dazu führt, dass eine Maschine die folgenden Verfahrensschritte
ausführt:
Übertragen, innerhalb eines Mehrgenerationen-Netzwerks (238), das ein Legacy-Gerät
(244) enthält, das gemäß einem Institute of Electrical and Electronic Engineers 802.11-Protokoll
arbeitet, mindestens eines Paketes (252) an das Legacy-Gerät (244), wobei das mindestens
eine Paket (252) einen modifizierten Zeitdauerparameter enthält; dadurch gekennzeichnet, dass
das Netzwerk (238) ein durchsatzstarkes Gerät (284) enthält, das gemäß einem Institute
of Electrical and Electronic Engineers-802.11TGn-Protokoll arbeitet; und
wobei der modifizierte Zeitdauerparameter mehreren der Reihe nach gesendeten durchsatzintensiven
Paketen (165) zugeordnet ist.
11. Speichermedium nach Anspruch 10, wobei der modifizierte Zeitdauerparameter so ausgewählt
wird, dass eine Ungleichbehandlung beim Medienzugang zwischen dem Legacy-Gerät und
dem durchsatzintensiven Gerät (284) vermieden wird.
12. Speichermedium nach Anspruch 10, wobei das mindestens eine Paket (252) einen Physical
Layer Convergence Procedure (PCLP)-Header enthält.
13. Vorrichtung, die Folgendes enthält:
ein Verarbeitungselement (228) zum Übertragen, innerhalb eines Mehrgenerationen-Netzwerks
(238), das ein Legacy-Gerät (244) enthält, das gemäß einem Institute of Electrical
and Electronic Engineers 802.11-Protokoll arbeitet, mindestens eines Paketes (252)
an das Legacy-Gerät (244), wobei das mindestens eine Paket (252) einen modifizierten
Zeitdauerparameter enthält; dadurch gekennzeichnet, dass
das Netzwerk (238) ein durchsatzstarkes Gerät (284) enthält, das gemäß einem Institute
of Electrical and Electronic Engineers-802.11TGn-Protokoll arbeitet; und
wobei ein wert des modifizierten Zeitdauerparameters kleiner ist als eine erste Dauer
(272) des mindestens einen Paketes (252).
14. Vorrichtung nach Anspruch 13, wobei der modifizierte Zeitdauerparameter auf einen
wert der ersten Dauer des mindestens einen Paketes (252), abzüglich eines Zeitraums
eines erweiterten Interframe-Raumes minus eines Zeitraum eines verteilten Interframe-Raumes,
gesetzt wird.
15. Vorrichtung nach Anspruch 13, wobei der modifizierte Zeitdauerparameter unter Verwendung
von Raten- und Längenwerten gesendet wird, die in einem Legacykompatiblen Bitübertragungsschicht-Header
enthalten sind.
1. Procédé, comprenant :
la transmission, dans un réseau de génération mixte (238) comprenant un dispositif
hérité (244) fonctionnant selon un protocole 802.11 de l'Institut des ingénieurs électriciens
et électroniciens, d'au moins un paquet (252) au dispositif hérité (244), dans lequel
ledit au moins un paquet (252) comprend un paramètre de durée modifié ; caractérisé en ce que :
ledit réseau (238) inclut un dispositif à haut débit (284) fonctionnant selon un protocole
802.11TGn de l'Institut des ingénieurs électriciens et électroniciens ; et
dans lequel le paramètre de durée modifé est associé à une pluralité de paquets à
haut débit transmis séquentiellement (165).
2. Procédé selon la revendication 1, dans lequel une valeur du paramètre de durée modifié
est inférieure à une première durée (272) dudit au moins un paquet (252).
3. Procédé selon la revendication 2, comprenant :
la définition du paramètre de durée modifié sur une valeur sensiblement égale à la
première durée (272), de laquelle est déduite une période d'un espace entre les trames
étendu moins une période d'un espace entre les trames distribué.
4. Procédé selon la revendication 1, comprenant :
l'utilisation d'une usurpation d'entête de procédure de convergence de couche physique,
en vue de transmettre le paramètre de durée modifié.
5. Procédé selon la revendication 1, comprenant :
l'ajustement d'un point temporel de détermination d'échec de code de redondance cyclique
associé audit au moins un paquet.
6. Procédé selon la revendication 1, comprenant :
l'évitement d'une iniquité en matière d'accès au support entre le dispositif hérité
et le dispositif haut débit (284).
7. Procédé selon la revendication 1, comprenant :
la définition du paramètre de durée modifié, en modifiant au moins l'un d'un champ
de longueur et d'un champ de débit.
8. Procédé selon la revendication 1, comprenant :
le formatage dudit au moins un paquet selon une norme 802-11 de l'Institut des ingénieurs
électriciens et électroniciens.
9. Procédé selon la revendication 1, comprenant en outre :
la mise en oeuvre d'une procédure de repli pour l'évitement d'une collision lors d'un
accès multiple de détection de porteuse.
10. Support de stockage mis en oeuvre par ordinateur, sur lequel des instructions sont
stockées, dans lequel lorsque lesdites instructions sont exécutées, une machine met
en oeuvre les étapes de procédé ci-dessous :
la transmission, dans un réseau de génération mixte (238) comprenant un dispositif
hérité (244) fonctionnant selon un protocole 802.11 de l'Institut des ingénieurs électriciens
et électroniciens, d'au moins un paquet (252) au dispositif hérité (244), dans lequel
ledit au moins un paquet (252) comprend un paramètre de durée modifié ; caractérisé en ce que
ledit réseau (238) inclut un dispositif à haut débit (284) fonctionnant selon un protocole
802.11TGn de l'Institut des ingénieurs électriciens et électroniciens ; et
dans lequel le paramètre de durée modifié est associé à une pluralité de paquets à
haut débit transmis séquentiellement (165).
11. Support de stockage selon la revendication 10, dans lequel le paramètre de durée modifié
est choisi de manière à éviter une iniquité en matière d'accès au support entre le
dispositif hérité et le dispositif à haut débit (284).
12. Support de stockage selon la revendication 10, dans lequel ledit au moins un paquet
(252) comprend un en-tête de procédure de convergence de couche physique.
13. Dispositif, comprenant :
un élément de traitement (228) pour transmettre, dans un réseau de génération mixte
(238) comprenant un dispositif hérité (244) fonctionnant selon un protocole 802.11
de l'Institut des ingénieurs électriciens et électroniciens, au moins un paquet (252)
au dispositif hérité (244), dans lequel ledit au moins un paquet (252) comprend un
paramètre de durée modifié ; caractérisé en ce que
ledit réseau (238) inclut un dispositif à haut débit (284) fonctionnant selon un protocole
802.11TGn de l'Institut des ingénieurs électriciens et électroniciens ; et
dans lequel une valeur du paramètre de durée modifié est inférieure à une première
durée (272) dudit au moins un paquet (252).
14. Dispositif selon la revendication 13, dans lequel le paramètre de durée modifié est
défini sur une valeur de la première durée dudit au moins un paquet (252), à laquelle
est déduite une période d'un espace entre les trames étendu moins une période d'un
espace entre les trames distribué.
15. Dispositif selon la revendication 13, dans lequel le paramètre de durée modifié est
transmis en utilisant des valeurs de longueur et de débit incluses dans un en-tête
de couche physique compatible avec les systèmes hérités.